In any event, patent classification is not dispositive to the issue of whether Reese relates to non-analogous art. See In re Ellis, 476 F.2d 1370, 1372 (C.C.P.A. 1973) (stating that while USPTO classification may provide “some evidence of ‘non-analogy,’ … the similarities and differences in structure and function of the inventions disclosed in the references to carry far greater weight.”) (emphasis in original).